On the inside of the left crank there is a small ring. The picture shows where the ring is meant to go.
The ring is smooth / flat on one side. The picture shows the flat side which seems to have been rubbed silver by friction. The flat side seems to be made of metal.
The other side has a raised ridge on the inner circumference. The raised ridge has a rubber/ plastic feel.
What is the correct way to install this ring?
(Please excuse the low resolution images. It's the best this phone can do.)
It's possible that I previously installed this ring the wrong way and that's perhaps why the one side is polished. The ring seems to fit best with the ridged-side towards the bearing.